PythonCharmers/python-future

urllib.request.urlopen from future.backports doesn't accept data URLs

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#442 opened on Mar 18, 2019

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 (1 comment) (0 reactions) (0 assignees)Python (1,172 stars) (327 forks)batch import
0.20enhancementhelp wanted

Description

Passing a data URL (such as "data:text/plain,hello") to urlopen raises a URLError, although this works in both Python 2.7 and Python 3.5. I'm not sure if this was added after Python 3.3 on which the backports code is based according to the source, but according to the 3.3 documentation it seems that it should have worked even in Python 3.3.

Contributor guide

Tech stack
python
Domain
apidata
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Knowledge of Python urllibUnderstanding of Python 2/3 compatibility
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the implementation of urllib.request.urlopen in the future.backports module. Compare the behavior with Python 3.3's urllib to see if data URL support was added in later versions. Determine the exact code difference needed to support data URLs while maintaining compatibility with Python 2. Ensure the fix aligns with the library's goal of backporting functionality from Python 3.x.